Already found it, but I'm not sure whether it's only effective in the USA or worldwide..
Are you familiar with that kind of stuff? So maybe you could help me out?

That would probably be best answered by a patent attorney. It's a lot cheaper to have an attorney give you the legal advice on it then a possible lawsuit by Kellyshu for violating any part of their patent. .(not saying they would sue you but if you violate their patent they have every right to.)